Add github actions to run tests

.github/workflows/rspec.yml

@@ -0,0 +1,15 @@
+name: CI tests
+on: push
+jobs:
+  run-rspec-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout the code
+        uses: actions/checkout@v3
+      - name: Setup Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+      - name: Run tests
+        run: |
+          bundle exec rspec